Effect of Stand-Off Distance on Impact Pressure of High Speed Water Jets

Sittiwong, Wuttichai; Seehanam, Wirapan; Pianthong, Kulachate; Matthujak, Anirut

doi:10.1063/1.3464938

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…There are some past works that study the optimal and critical stand‐off distance for a pressurized nozzle to address the efficacy of the fluid jet at various distances, such as (Chao et al, 1995; Huang et al, 2020; Sittiwong et al, 2010; Srivastava et al, 2020) for abrasive jet cutting technology and (Anglani et al, 2016; Guha et al, 2010a, 2010b; Leu et al, 1998) for high‐pressure water jet cleaning process. For abrasive jet cutting, the stand‐off distance between the target and the diameter of the nozzle orifice are small, typically between ~ 10 and 100 mm.…”

Section: Related Work and Contributionsmentioning

confidence: 99%

Towards fluid force estimation of a water‐jetting aerial robot with hybrid kinematics‐force model

Lee

Tang

et al. 2022

Journal of Field Robotics

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In this paper, a three-dimensional hybrid kinematics-force (HKF) model for fluid force estimation coupled with position optimization of an aerial robot capable of high-pressure fluid ejection is presented. Motivated by the archerfish's unique (water-jetting) hunting mechanics, the HKF model comprises of two sub-models (hybrid kinematics and fluid force estimation) to maintain a specific fluid force at the point-of-contact (POC) during high altitude fluid jetting for high-risk maintenance (cleaning) scenarios. Industries with high-risk cleaning applications seek to employ robots to assist cleaners in routine operations on infrastructures or equipment at a height such as photovoltaic e-glasses, impact-sensitive objects, and many others. For a fluid jet, the stand-off distance represents the length of the fluid trajectory between the nozzle orifice and POC, and is also a vital variable in fluid force control.If the stand-off distance between the ejection source and the target is large, the fluid stream loses energy along the trajectory and the force at the POC is weakened thus losing some of the jet pressure at the target surface. The HKF model exploits this by estimating and maintaining a specific force at the POC through position optimization of the onboard nozzle coupled with the knowledge of the fluid parameters.To innovate high structure cleaning, the HKF model can be employed on an aerial robot with fluid ejection capabilities for accurate fluid force control at the POC. For high-pressure fluid ejection (on horizontal and vertical structures), the HKF model is able to predict the (high pressure) fluid force at the POC with less than 10% error.The proposed HKF model is tested and verified through simulations and the experimentation results are validated by flying the physical prototypes in actual deployment scenarios.

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Section: Related Work and Contributionsmentioning

confidence: 99%

Towards fluid force estimation of a water‐jetting aerial robot with hybrid kinematics‐force model

Lee

Tang

et al. 2022

Journal of Field Robotics

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“…Water pressure, nozzle radii, number of orifices in the nozzle and stand-off distance between the nozzle and the surface are some of the important parameters to be optimized for obtaining a surface free from contamination [ 27]. The impact pressure force generated by the water jet striking the surface decreases with the increase in stand-off distance [31]. Denjet has recommended pressure settings according to the industries and type of material to be removed [32].Other than cleaning, applications of high pressure wate rjet includes surface texturing, surface preparation and peening of the metals [33].…”

Section: B Water Jet Cleaningmentioning

confidence: 99%

A Short Review on Alternative Cleaning Methods to Remove Scale and Oxide from the Jet Engine Alloys

Muthukumar¹

2015

IJERT

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The hot section of the aircraft engine (e.g.: stator casing, turbine blades, etc.,) often gets contaminated with the scale, soil and dirt during its operation. These contaminations adhere strongly to the surface along with oxide build up due to the very high operating temperatures. It severely affects the performance of the gas turbine engine by decreasing its efficiency. As of now, chemical cleaning is the most widely used method by the engine manufacturers and maintenance service providers around the world to restore the material aesthetics and efficiency. Though there are number of cleaning chemistry which could successfully remove these contamination's from the surface, major shortcomings like processing time, disposal (some solvents and chemicals are toxic and not environmental friendly, requires special disposal procedures), user's health & safety and efficiency in cleaning the complex geometries and large parts makes the manufacturers and maintenance service providers to look for alternative cleaning methods. In this paper, some of the commercially available alternative cleaning methods are discussed along with their working principle, capabilities, applications, advantages and disadvantages.

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“…To measure these high pressure, the pressure sensor was designed, manufactured and calibrated [12] in this study. The pressure sensor is constructed with Polyvinylidence Fluoride (PVDF) piezoelectric film, a 6 mm thick of PMMA and a 8 mm thick rubber support.…”

Section: Fig 5 Experiments Setup For Impact Pressure Measurementmentioning

confidence: 99%

Effect of Stand-Off Distance on Impact Pressure of High-Speed Water Jet Injected in Water

Matthujak

Kasamnimitporn

Sittiwong

et al. 2011

AMM

Self Cite

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This study is to measure the impact pressure of high-speed water jet injected in water at the stand-off distance from the nozzle exit. The high-speed water jets are generated by the impact of a projectile, which known as impact acceleration method, launched by Horizontal Single Stage Power Gun. The maximum averaged jet velocity of about 374.24 m/s in water was generated in this experiment. The impact pressure of high-speed water jet in water at the stand-off distance 15, 20, 30 and 40 mm from the nozzle exit was measured by the PVDF pressure sensor. Moreover, the impact phenomena of the jet were visualized by a high-speed video camera with shadowgraph optical arrangement. From the pressure sensor, two peak over-pressures are always observed in this experiment. From visualization, it was found that the two peak over-pressures of 24 GPa and 35 GPa at x = 15 mm were generated by the jet and the bubble impact, respectively. The peak over-pressure decreases exponentially as the stand-off distance between the PVDF pressure sensor to the nozzle exit increases. Moreover, the jet and the bubble impact on the PVDF pressure sensor, shock waves, and bubble deformation were obviously observed in this study.

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Effect of Stand-Off Distance on Impact Pressure of High Speed Water Jets

Cited by 5 publications

References 18 publications

Towards fluid force estimation of a water‐jetting aerial robot with hybrid kinematics‐force model

Towards fluid force estimation of a water‐jetting aerial robot with hybrid kinematics‐force model

A Short Review on Alternative Cleaning Methods to Remove Scale and Oxide from the Jet Engine Alloys

Effect of Stand-Off Distance on Impact Pressure of High-Speed Water Jet Injected in Water

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